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Finding the Fourth Proportional to 638.24, 956.93 and 221.66

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Solution

The fourth proportional to 638.24, 956.93 and 221.66 is: 332.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.24 : 956.93 = 221.66 : x
  2. Step 2: Convert to fraction form
    638.24/956.93 = 221.66/x
  3. Step 3: Cross multiply
    638.24x = 956.93 × 221.66
  4. Step 4: Simplify right side
    638.24x = 212,117.43
  5. Step 5: Solve for x
    x = 212,117.43/638.24
  6. Step 6: Final answer
    x = 332.35

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.